diff mbox

ALSA: hdsp: silence a sprinft() overflow warning

Message ID 20150822092413.GA13454@mwanda (mailing list archive)
State New, archived
Headers show

Commit Message

Dan Carpenter Aug. 22, 2015, 9:24 a.m. UTC 
card->shortname is a 32 char string so the sprintf() can theoretically
overflow.  snd_rawmidi_new() can accept strings up to 64 bytes long.

I have made the temporay buf[] array 40 bytes long and changed the
sprintf() to snprintf().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Comments

Takashi Iwai Aug. 22, 2015, 9:37 a.m. UTC | #1 
On Sat, 22 Aug 2015 11:24:13 +0200,
Dan Carpenter wrote:
> 
> card->shortname is a 32 char string so the sprintf() can theoretically
> overflow.  snd_rawmidi_new() can accept strings up to 64 bytes long.
> 
> I have made the temporay buf[] array 40 bytes long and changed the
> sprintf() to snprintf().
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Applied, thanks.


Takashi

> 
> diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
> index 468a95c..afb2dea 100644
> --- a/sound/pci/rme9652/hdsp.c
> +++ b/sound/pci/rme9652/hdsp.c
> @@ -1526,7 +1526,7 @@ static struct snd_rawmidi_ops snd_hdsp_midi_input =
>  
>  static int snd_hdsp_create_midi (struct snd_card *card, struct hdsp *hdsp, int id)
>  {
> -	char buf[32];
> +	char buf[40];
>  
>  	hdsp->midi[id].id = id;
>  	hdsp->midi[id].rmidi = NULL;
> @@ -1537,7 +1537,7 @@ static int snd_hdsp_create_midi (struct snd_card *card, struct hdsp *hdsp, int i
>  	hdsp->midi[id].pending = 0;
>  	spin_lock_init (&hdsp->midi[id].lock);
>  
> -	sprintf (buf, "%s MIDI %d", card->shortname, id+1);
> +	snprintf(buf, sizeof(buf), "%s MIDI %d", card->shortname, id + 1);
>  	if (snd_rawmidi_new (card, buf, id, 1, 1, &hdsp->midi[id].rmidi) < 0)
>  		return -1;
>  
>
diff mbox

Patch

diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index 468a95c..afb2dea 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -1526,7 +1526,7 @@  static struct snd_rawmidi_ops snd_hdsp_midi_input =
 
 static int snd_hdsp_create_midi (struct snd_card *card, struct hdsp *hdsp, int id)
 {
-	char buf[32];
+	char buf[40];
 
 	hdsp->midi[id].id = id;
 	hdsp->midi[id].rmidi = NULL;
@@ -1537,7 +1537,7 @@  static int snd_hdsp_create_midi (struct snd_card *card, struct hdsp *hdsp, int i
 	hdsp->midi[id].pending = 0;
 	spin_lock_init (&hdsp->midi[id].lock);
 
-	sprintf (buf, "%s MIDI %d", card->shortname, id+1);
+	snprintf(buf, sizeof(buf), "%s MIDI %d", card->shortname, id + 1);
 	if (snd_rawmidi_new (card, buf, id, 1, 1, &hdsp->midi[id].rmidi) < 0)
 		return -1;